A new, to our knowledge, optical method for small-angle measurement
based on surface-plasmon resonance (SPR) is presented. In this
method the high sensitivity of the phase of SPR to the angle of
incidence is employed to improve the resolution of the measurement of
the angle. Small-angle measurement is performed by the monitoring
of the phase shift resulting from the minute change of the angle of
incidence with the use of magneto-optical modulation. The validity
of this method is demonstrated, and a measurement resolution of 0.2 arc
sec is achieved experimentally.
© 1999 Optical Society of America
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